Dual duct air conditioning systems



A. H. SAWYER Dec. 5, 1967 DUAL DUCT AIR CONDITIONING SYSTEMS 3 Sheets-Sheet 1 Filed Nov. 5, 1965 om mm UM 3m mmml UC-dQZDNZQ I UO MUMDOW INVENTOR. ANDREW H. SJWYE P BY 0 Dec. 5 1967 A. H. SAWYER 3,356,134

DUAL DUCT AIR CONDITIONING SYSTEMS Filed Nov. 1965 5 Sheets-Sheet 2 v vv v i? g; G n E w INVENTOR. Q ANDREW H. SAM/YER BY U 6. Q

A. H. SAWYER Dec. 5, 1967 DUAL DUCT AIR CONDITIONING SYSTEMS 5 Sheets-Sheet 5 Filed Nov. 5, 1965 INVENTOR.

ANDREW SAM YER United States Patent Pennsylvania Filed Nov. 5, 1965, Ser. No. 506,470

3 Claims. (Cl. 165-49) This invention relates to improvements in dual duct air conditioning systems and more particularly to such systems which employ cellular metal flooring sections as a structural component of the floor of a multi-story building and also as conduits for delivering conditioned air throughout the building structure. Such building air conditioning systems have been described in the Goemann patent, US. 2,729,429.

Large multi-story buildings, during cold weather, re quire heating only in the perimeter areas. (The top floor under an exposed root surface may require interior heating. Said floors are not a major ventilating consideration.) The interior areas of large buildings do not require heating-and in fact, require cooling, even in cold weather. The human occupants of the building and the electrical machines and artificial illumination in the interior of such buildings generate heat which must be compensated in order to maintain a desirable temperature within the building. The outside rooms of the building however require a supply of heat in the winter time and a supply of cold air in the summer time. All of the building rooms require ventilation air throughout the year.

When the building is constructed in accordance with the present invention, the requirements of the perimeter zone and the interior zone year round can be accommodated by a double utilization of the structural flooring cells.

According to this invention the perimeter air outlet units, are connected to a pair of air delivery cells one of which is always cold and the other of which 1s normally winter season) and at other times may be cold. The air outlets in the interior of the building are at all times connected to receive conditioned air from one or two of the structural cells both of which are delivering cold air. Where two air structural cells are connected to the interior mixing units, one of those cells may contain tempered air which is defined as air at the approximate desired temperature within the interior of the building.

structural air cells of each group of air cells delrvers hot air at its ends and cold or tempered air in its intermediate portion, thereby performing the double utilization.

In order to accomplish the present results it is essential that the hot air be delivered to the individual structural air cells by means of hot air conduits which extend transversely across the structural cells in the region immediatel.-y adjacent to the exterior wall of the building. Likewise the cold air (and tempered air, if provided) is delivered by conduit means which extend transversely across the structural air cells along the central portion of the building. The individual cells Within the building which are called upon for double utilization are equipped with suitable baflle members for separating the hot air in the exterior portions of such cells from the cooler air in the interior portions of the same cells.

OBJECTS The principal object of this invention is to provide for complete ventilation and air conditioning of a multi-story building by utilizing a minimum number of structural air cell units. A further object of this invention is to provide an efiicient air distribution system which avoids or minimizes undesirable intermediate exchange of heat energy between segregated air streams, hot and cold, prior to 3,356,134 Patented Dec. 5, 1967 their blending for distribution into different zones of the building.

These objects and other advantages of the present invention will become more apparent by reference to the following detailed description and to the accompanying drawings in which:

FIGURE 1 is a fragmentary perspective illustration of the metal cellular flooring system in modern multi-story building showing the sub-floor construction wherein the present invention is utilized;

FIGURE 2 is a plan view of a typical floor of a multistory building showing one embodiment of the present invention; and

FIGURE 3 is a plan view of a typical floor of a multi' story building utilizing an alternative embodiment of the present invention.

Referring to FIGURE 1 there is illustrated a typical floor of a multi-story building 10 which is supported on a number of generally horizontal beams 12. The building floor comprises side-by-side metal cellular flooring sections 13 and special air-carrying structural cells 15, 16. The individual flooring sections 13 provide a number of longitudinal cells 14 which serve as raceways for distribution of electrical wiring throughout the interior of the building 10. Crossover electrical ducts 17, 18 are provided for distributing electrical wiring to and from the The building 10 has an outer wall 20 which is normally provided with windows 21. The building customarily is 2,877,990 and 2,987,328.

Preconditioned air from the air cells 15, 16 is delivered to a perimeter mixer outlet 29 which is located adjacent to the outer wall 20. The perimeter mixer outlet 29 is provided with valving devices suitable for blending a the individual room of building 10 in which the perimeter mixer outlet 29 is located. Typical valving is shown in US. Patents 2,957,629 and 2,970,768. Customarily a thermostat 30 is provided on the interior wall 22 in the same room with the perimeter mixer outlet 29. The thermostat 30 normally receives a pneumatic pressure supply from a pneumatic supply conduit 31 and delivers a pneumatic impulse signal to a conduit 32. Customarily the perimeter mixer outlet 29 receives two distinct streams of preconditioned air which are blended in accordance with pneumatic impulse signal delivered through the pneumatic conduit 32. Typical air mixing units are described in US. Patents 2,835,449, 2,841,070, 2,856,131, 2,880,743, 2,880,752, 2,883,111, 2,891,576, 2,896,849, 2,957,629, 2,998,194, and the like.

Conditioned air also is delivered from the air cells into interior mixer outlets, for example, from the air cell 15 through an air flow connection 33 to an interior mixer outlet 34. The interior mixer outlet 34 may receive only cold air or may receive a blend of cold air and tempered air as will be hereinafter described. Hot air may be delivered to interior mixer outlets 34 where they 3 discharge mixed air into building areas under exposed roof areas. Typical interior mixer outlets are described in U.S. Patent 3,026,041.

The present invention may best be understood by reference to FIGURE 2 of the drawings which is a plan view of a typical multi-story building 40 having opposed end walls 41, 42 and opposed side walls 43, 44. Such buildings normally have a vertical service core 45 in which a duct for hot air 46 and a cold air duct 47 are provided.

The metal floor of the building includes a plurality of pairs of air cells including a side pair 48, 49 along the side wall 43, a side pair 50, 51 along the opposite side wall 44, and interior pairs 52, 53.

Perimeter air mixer outlets 54 are provided along the outer side wall 43. Perimeter air mixer outlets 55 are provided along the outer side wall 44. Perimeter air mixer outlets 56 are provided along the outer end wall 41. Perimeter air mixer outlets 57 are provided along the outer end wall 42.

It will be seen that the perimeter air mixer outlets 54, 56a, and 57a are connected to receive conditioned air from the air cells 48, 49. The perimeter air mixer outlets 54 are connected to the air cells 48, 49 by connecting conduits 58, 59 respectively. Similarly the perimeter air mixer outlets 55, 56b, 57b are connected to receive air from the air cells 50, 51. The perimeter mixer air outlets 55 are connected to the air cells 50, 51 by connecting conduits 60, 61 respectively.

The building has a plurality of interior air mixer outlets 62 each of which is connected to at least one of the air cells 52, 53 for receiving a supply of air from one or both of those cells.

The hot conditioned air is delivered from the vertical hot air duct 46 to the air outlets by means of a hot air duct which includes a first duct 63 which extends from the vertical hot air duct 46 along the end wall 41 thence through a hot air duct 64 which extends along the side wall 44, thence through a hot air duct 65 which extends along the end wall 42, thence through an air duct 66 which extends along the side wall 43 and thence through an air duct 67 which extends along the end wall 41 back to the vertical hot air duct 46. It will be observed that the hot air ducts 63, 65, 67 pass transversely across the interior air cells 52, 53 along the outer end walls 41, 42 of the building 40. The hot air ducts 64, 66 serve as connections between the hot air ducts 63, 65 and the hot air ducts 67, 65. The hot air ducts 64, 66 also deliver conditioned air to the lateral air cells 50, 48 respectively by means of connecting conduits 68, 69 respectively.

Heated air from the conduit 65 is delivered to the air cells 52 adjacent to the perimeter outlet boxes 57 through gas flow connections 70 at the point of cross-over between the hot air conduit 65 and the air cells 52. Similarly air flow connections 71 are provided between the hot air conduit 63 and the air cells 52 adjacent to the perimeter mixer outlets 56. Likewise air flow connections 72 are provided between the hot air conduit 67 and the air cells 52 adjacent to the perimeter where the hot air conduit 67 crosses over the air cell 52a. It will be observed that each of the air cells 52a, 52d, 52c, 521, 52g is equipped with a baffie element 74 interiorly of the air flow connections 71, 72 to prevent air from flowing through the interior portion of the air cells from the hot air ducts 63, 67. Similarly a plurality of battle elements 75 is provided in each of the air cells 52 and located inwardly of the air flow connections 70 to prevent air from flowing into the interior of the air cells 52 from the hot air duct 65.

The vertical cold air riser 47 is provided with a pair of feeder ducts 76, 77 (as shown) which provide cold air to the transverse cold air ducts 7 8, 79 respectively. Sometimes only one feeder duct is required; sometimes more than two feeder ducts are required.

The cold air duct 78 is connected to the air cell 49 at one end and to the air cell 51 at the other end by means of air flow connections 80, 81 respectively. Additional air flow connections 82, 83 join the cold air duct 78 with the 4 air cell 49. Similarly additional air fiow connections 84, 85 join the cold air duct 78 with the air cell 51. The cold air duct 78 is equipped with air flow connections 86 to each of the interior air cells 53.

The cold air duct 79 is equipped with air flow connections 87 joining with the interior portion of the air cells 52 between the baflle members 74, 75.

Thus it will be apparent that each of the interior air mixer outlet units 62 is adapted to receive air (A) from the vertical cold air duct 47 through the feeder duct 76, the cold air duct 78, and air fiow connections 86, and the air cell 53 and also (B) from the vertical cold air duct 47 through the feeder duct 77, through the cold air duct 79, to the air flow connections 87 and through the air cells 52 between the baflle elements 74, 75. It will be observed that the air cells 52b, 53b, 52c, 530 are terminated short of the end wall 41 by the interposition of the vertical service core 45. Accordingly those air cells 52b, 53b, 52c, 53c are equipped with end closer elements 88. Such end closer elements are described in U.S. Patent 3,025,883.

Each of the perimeter air mixer outlet units 56 along the outer end wall 41 receives hot air from the exterior portion of the air cell 52 and receives cold air from the air cell 53. Likewise the perimeter air mixer outlet units 57 along the outer end wall 42 receive hot air from the exterior portion of the air cells 52 and receive cold air from the air cells 53.

The air mixer outlet units 54 along the outer side wall 43 as well as the perimeter air mixer outlets 56a, 57a receive hot and cold air from the air cells 48, 49 respectively. Similarly the perimeter air mixer outlet units 55 along the outer side wall 44 and the perimeter air mixer outlet units 56b, 57b receive hot air and cold air from the air cells 50, 51 respectively.

It will be observed that each of the interior air cells 52 serves a dual function, namely as a conduit for hot air along the exterior portion thereof beyond the baffle elements 75, 74 and also as a conduit for cold air along the interior portions between the bafile elements 74, and, in the case of the air cells 52b, 52c, between the bafile elements 75 and the end closer elements 88.

It should be observed that the hot air, after leaving the hot air ducts 63, 64, 65, 66, 67, moves through a relatively short distance in the air cells 52 before mixing and discharge into the perimeter rooms of the building 40. Thus there is very little opportunity for the temperature of the hot air in the hot air ducts to be dissipated before the release of that hot air stream. Similarly by providing the hot air ducts around the perimeter of the building 40 as shown in FIGURE 2, there are no hot air ducts traversing the interior zone of the building which might permit the undesirable interior zone heating of the ventilation streams.

It will further be observed that only a limited number of the mixer outlet units 54, 55, 56, 57, 62 will be fed from any one air cell. Consider for example the air cells 52d, 53d. Between the air cold ducts 78, 79 and the end wall 41 there are two interior mixing outlets 62 and one perimeter mixing outlet 56. Between cold air ducts 78, 79 and the end wall 42 there are three interior mixing outlet units 62 and one perimeter mixing outlet 57. Along a side wall, considering the side wall 43, for example, one air flow connection and two additional air flow connections 82, 83 are provided for the nine perimeter air mixer outlet units 56a, 54, 57a.

SEASONAL CHANGEOVER As described in U.S. Patents 2,898,044, 2,970,768 and 3,019,987, during the hot weather seasons it is possible to provide cold air through the vertical air riser duct 46 and through the air ducts 63, 64, 65, 66, 67 so long as suitable changes are made in the air mixing apparatus. It should be apparent that by introducing cold air into the vertical air riser duct 46 as well as into the vertical air riser duct 47, the entire building as shown in FIGURE 2 may be cooled and ventilated during the hot weather seasons. Each of the outlets 54, 55, 56, 57, and 62 Will receive more or less cold air as required, for ventilation and cooling.

The vertical cold air riser duct 47 is shown as a single conduit in FIGURE 2. Separate conduits could replace the single riser duct 47, one of which supplies the duct 76 and the other of which supplies the duct 77. With such provisions, the air within the two ducts 76, 77 need not be of identical condition, but instead could be of different condition, e.g., of different temperature, diiferent humidity, different ratio of fresh air-to-recirculated air, at cetera.

EMBODIMENT OF FIGURE 3 FIGURE 3 presents a plan view of a building 90 which is similar to the building shown in FIGURE 2. The building 90 has end walls 91, 92 and side walls 93, 94 with a vertical service core 95 containing a vertical hot air riser duct 96, a vertical cold air riser duct 97 and a vertical tempered air riser duct 98. Thus the building of FIGURE 3 differs principally from the building of FIGURE 2 in the provision of a third source of conditioned air for ventilating and air conditioning the building 90. The third source is maintained at approximately the desired interior building temperature and serves primarily as a constant source of ventilation.

The air cells of the building 90 are provided in pairs 99, 100 along the side wall 93 and in pairs 101, 102 along the side wall 94. The interior air cells are provided in groups of three and are identified by the numerals 103, 104, 105. Perimeter air mixer outlets 106 are provided along the end wall 91 and perimeter air mixer outlets 107 are provided along the end wall 92. Perimeter air mixer outlets 108 are provided along the side wall 93 and perimeter air mixer outlets 109 are provided along the side wall 94. Connecting conduits 110 and 111 join the perimeter air mixer outlets 108 to the lateral air cells 99, 100 respectively. Connecting conduits 112, 113 join the perimeter air mixer outlets 109 to the lateral air cells 101, 102 respectively.

Interior air mixer outlets 114 are provided on the interior of the building spanning at least a pair of the group of air cells 103, 104, 105 and connected to a pair of such cells including the air cell 104 and one or the other of the air cells 103, 105.

Hot air from the vertical hot air riser 96 is delivered through a connecting duct 115 to a hot air duct 116 which extends along the outer end wall 91 and joins at its ends hot air ducts 117, 118 which extend along the outer side walls 93, 94 respectively and each in turn join with a hot air duct 119 which extends along the outer end wall 92. Three connectin conduits 120 join the hot air duct 117 with the air cell 99 along the side wall 93. Three connecting conduits 121 join the hot air duct 118 with the air cell 101 along the side wall 94.

Air flow connections 122 are provided between the hot air duct 116 and the external portions of the underfloor air cells 104 along the end wall 91. Air flow connections 123 are provided between the hot air duct 119 and the external portions of the air cells 104 along the end wall 92. Suitable baffles 124 are provided in the air cells 104 adjacent to the outer end wall 91 and similar baffles 125 are provided in the air cells 104 adjacent to the outer end wall 91 and cells 104 adjacent to the outer end wall 92. In each instance the baflies 124, 125 are disposed inwardly with respect to the air flow connections 122, 123 respectively. The baffles 124, 125 prevent the air from the hot air ducts 116, 119 from entering. into the central portion of the air cells 104.

Cold air from the vertical cold air riser duct 97 is delivered through a cold air duct 126 to a transverse cold air duct 127 which extends across each of the groups of three underfloor air cells.

Air flow connection 128 are provided between the transverse cold air duct 127 and each underfloor air cell similar bafiies 125 are provided in the air air cells 103, 105.

103. Similarly air flow connections 129 are provided between the transverse cold air duct 127 and the underfloor air cells 105. Thereby each of the underfloor air cells 103, 105 receives cold air directly from the vertical cold air riser duct 97.

Independent air flow connections including conduits 130, 131 and an air flow connection 132 deliver cold air from the vertical cold air riser duct 97 to the interior of the outside cold air cell 100 along the outer side wall 93. Similarly cold air is delivered from the transverse cold air duct 127 through conduits 133, 134 and air flow connection 135 into the outside cold air cell 102 along the outer side wall 94. It will be observed that the air cells 100, 102, 103, and 105 at all times are receiving cold air from the vertical cold air riser duct 97.

Tempered air from the vertical tempered air riser duct 98 is delivered through a conduit 136 to a transverse tempered air duct 137 which has air flow connections 138 leading into the central portion of each of the underfloor air cells 104. The tempered air is delivered from the vertical tempered air riser duct 98 into the interior of the air cells 104 for ultimate distribution through the interior air mixer outlets 114 only. The tempered air in the building is not delivered to any of the perimeter air mixer outlets 106, 107, 108, 109.

It will be observed that the air cells 103b, 104b, 1051), 1030, 1040, 1050 are terminated short of the end wall 91 by the interposition of the vertical service core 95. Accordingly those air cells 103b, 104b, 105b, 1030, 104e, 105a are equipped with end closer elements 139.

The lateral air cells 99, receive hot and cold air respectively and deliver that material to the perimeter air mixer outlets 108, 106a, 107a. The lateral air cells 101, 102 receive hot and cold air respectively and deliver that material to the perimeter outlet units 106b, 107b, 109. The interior air mixer outlets 114 receive tempered air from the interior portion of the air cells 104 and also receive cold air from one or the other or both of the cold Each of the air cells 104 has hot air in its external portions beyond the bafile members 124, 125 and has tempered air in the central portion between the baflle members 124, 125 and, in the instance of the air cells 104b, 1040, between the baflle members 125 and the end closer elements 139.

With the arrangement shown in FIGURE 3, no single air cell delivers air to more than three air mixer outlets. All of the heated air in the hot air ducts 116, 117, 118, 119 is maintained around the perimeter of the building 90 and is delivered to perimeter air mixer outlets by relatively short travel through underfloor air cells, i.e., between the baflle members 124, 125 and the outer wall. If desired, as taught in US. Patent 2,957,628, each of the three underfloor air cells 103, 104, may supply air to the perimeter air mixer outlets 106, 107 and to the interior air mixer outlets 114.

SEASONAL CHANGEOVER As described in US. Patents 2,898,044, 2,970,768 and 3,019,987, during the hot weather seasons it i possible to provide cold air through the vertical air riser ducts 96 and 98 in addition to the vertical air riser duct 97. Suitable changes must be made in the air mixing apparatus as described in the aforementioned patents. During the seasonal changeover condition the entire building shown in FIGURE 3 may be cooled and ventilated. Each of the outlets 106, 107, 108, 109, 114 will receive more or less cold air for ventilation and cooling.

It should be understood in connection with the flooring plan which is seen in FIGURES 2 and 3 that the floor area of the buildings 40, 90 is normally divided into corridors and rooms in a typical'manner. Preferably the corridors follow the path of the air distributing ducts 63, 64, 65, 66, 76, 77, 78, 790i FIGURE 2 whereby a lower ceiling corridor will accommodate higher ceiling room spaces in the building as described in US. Patent 2,729,429.

It should be further understood that the perimeter air mixing outlets and the interior air mixing outlets which are illustrated schematically in FIGURES 2 and 3 can be located in the ceiling of the individual rooms or in the floor or walls of the individual rooms as desired. It should be kept in mind, referring to FIGURE 2 for example, that the perimeter air mixing outlets 54, 55, 56, 57 may service the rooms above the illustrated floor level where as the interior air mixer outlets 62 may service the rooms beneath the illustrated floor level. Since each of the individual air mixer outlets is controlled by a thermostatic regulating unit which is located in the room which is serviced by the individual outlet, it should be apparent that each such individual outlet operates independently of the others. Frequently some dependence of one outlet upon another occurs when there is a relatively heavy load upon the air distributing facilities. The flooring arrangements disclosed in the present specification and drawings avoid severe interdependence of the individual outlets since, as hereinabove mentioned, there are no more than four air mixer outlets drawing upon any underfloor air cell on any side of the air supply ducts. Accordingly loss of ventilation air pressure at certain ones of the air mixer out1ets-a problem which has plagued prior air distributing installations-is completely avoided by the present arrangement.

A further problem which has become apparent in prior installations is the tendency of hot air streams and cold air streams to approach an intermediate temperature as they move from the supply source throughout the building. That is, the cold air tends to become warmer and the hot air tends to become cooler in transit through the building. Most of the thermal interchange occurs directly between the two streams of conditioned air with the result that the temperature difference between the so-called hot air stream and the so-called cold air stream at the air mixer outlet may be severely diminished. The result of this thermal interchange is severe reduction in the range of temperature regulation which can be achieved by the manipulation of a thermostat within an individual room. Ideally a cold air supply source at about 55 F. can be provided and a hot air supply source at about 125 F. can be provided. If these two streams at their initial temperature level could be introduced directly to a room, the environment within that room could be maintained at any selected temperature over a range of perhaps 70 to 90 F. Where however temperature interchange does occur, the cold air supplied to a room might rise to a temperature of 75 and the hot air might lower to a temperature of 100. The incoming air from either of such interchanged streams is not adequate to provide the desired thermal regulation within the room.

This problem is clearly avoided by the arrangement :shown in FIGURES 2 and 3. Only cold air is distributed in the interior portion of the building in FIGURE 2 and accordingly temperature interchange between two air streams is not manifested. The hot air streams and the cold air streams are not disposed adjacent to each other except in the periphery of the building, where heating is required, and then only for short distances prior to their mixing and discharge into the perimeter rooms.

I claim:

1. In a multi-story building distribution system for conditioned air having parallel structural cells which serve as air distributing conduits and also serve as structural members for the floor of the building, the combination comprising:

at least two sources of conditioned ventilation air, one

of which during the building heating season is hotter than the others and is identified as the first source;

baffie members in certain ones'of said cells to divide those certain cells into an exterior portion outboard of the baflle and an interior portion inboard of the bafile;

fi st conduit means extending from the said first source transversely of the said parallel cells adjacent to the perimeter of the building and outboard of the said baffle members;

flow connections between the said first conduit means and the said exterior portions of the said cells;

additional conduit means extending from the other of said sources transversely of the said parallel cells along the central portion of said cells inboard of the said bafile members;

additional flow connections between said additional conduit means and (a) those cells which are free of the said bafile members and (b) the interior portions of said certain cells having baflle members, whereby the said cells having baffle members receive air from said first source in the exterior portion thereof and receive air from a different source in the interior portions thereof;

a plurality of air mixing outlets throughout the building each being associated with at least two of said cells including one cell having said baffie members and another cell which is free of said baffie members.

2. The mu'lti-story building distribution system of claim including:

a first source of conditioned ventilation air, which is under one set of conditions hotter than the desired interior building temperature and, under another set of conditions, is colder than the desired interior building temperature;

a second source of conditioned air being maintained at a lower temperature than the desired interior building temperature;

first conduit means for a first stream of conditioned air from said first source extending transversely of said parallel cells adjacent to the ends of said cells;

second conduit means for a second stream of conditioned air from said second source extending transversely of said parallel cells along the central portion of said cells;

said first conduit means being disposed between (a) said second conduit means and (b) the outside walls of said building, said first conduit means including connecting conduit means which extend parallel to the outside walls of the said building;

the interior ones of said parallel cells being arranged in groups of two such cells including a first cell and a second cell; said second cell having a bafile member disposed interiorly of the cross over point of said first conduit means and said second cell for dividing each of said second cells into (a) an interior portion which is disposed interiorly of the said bafile member and (b) an exterior portion disposed between the said bafile member and the outside wall of the building;

first air fiow connections between the said first conduit means and the exterior portion of the said second cells;

second air flow connections between the said second conduit means and each of the said first cells;

third air flow connections between the said second conduit means and the interior portion of each of said second cells;

whereby the said first cells receive at all times air from the said second source, said second cells receive at all times air from the said second source in the said interior portion and receive at all times air from said first source in the said exterior portion;

a plurality of perimeter mixing outlets adjacent to the outside walls of said building, each being associated with said group of tWo eel-ls and connected to receive air from the said exterior portion of the said seclond cell of each group and also from the said first cel a plurality of interior mixing outlets disposed throughout the interior of the building, each associated with one of said groups of two cells and each being con- 1 including:

a first source of conditioned ventilation air which is posed bet-ween the said bafiie member and the outside wall of the building; first air flow connections between the said first conduit means and the exterior portion of the said second 5 cells; under one set of conditions hotter than the desired second air flow connections between the said second interior building temperature and, under another set conduit means and each of the said first cells; of conditions, is colder than the desired interior third air flow connections between the said second conbuilding temperature; duit means and each of the said third cells;

a second source of conditioned air being maintained l0 fourth air flow connections between the said third conat a lower temperature than the desired interior buildduit means and the interior portion of each of said ing temperature; second cells;

a third source of conditioned air being maintained at a whereby the said first cells and said third cells receive temperature approximating the desired building at all times air from the said second source, said temperature; second cells receive at all times air from the said first conduit means for a first stream of conditioned air third source in the said interior portion and receive from said first source extending transversely of said at all times air from said first source in the said exparallel cells adjacent to the ends of said cells; terior portion;

second conduit means for a second stream of condia plurality of perimeter mixing outlets adjacent to the tioned air from said second source extending transoutside walls of said building, each being associversely of said parallel cells along the central portion ated with said group of three cells and connected to of said cel-ls; receive air from the said exterior portion of the said third conduit means for a third stream of conditioned second cell of each group and also from one of the air from said second source extending transversely first and third cells; of said parallel cells along the central portion of 5 a plurality of interior mixing outlets disposed throughsaid cells; said first conduit means being disposed out the interior of the building, each associated with between (a) said second conduit means and (b) the one of said groups of three cells and each being conoutside walls of said buildings, said first conduit nected to receive air from the interior portion of a means including connecting conduit means including said second cell and also from one of the first and connecting conduit means which extend parallel to third cells. the outside walls of the said building; References Cited the interior ones of said parallel cells being arranged in UNITED STATES PATENTS ;;.%Zti% itii bailie member disposed interiorly of the cross over 2912231 11/1959 Goemann 49 point of said first conduit means and said second cell ROBERT A. OLEARY, Primary Examiner. CHARLES SUKALO, Examiner.

for dividing each of said second cells into (a) an interior portion which is disposed interiorly of the said bafile member and (b) an exterior portion dis- 

1. IN A MULTI-STORY BUILDING DISTRIBUTION SYSTEM FOR CONDITIONED AIR HAVING PARALLEL STRUCTURAL CELLS WHICH SERVE AS AIR DISTRIBUTING CONDUITS AND ALSO SERVE AS STRUCTURAL MEMBERS FOR THE FLOOR OF THE BUILDING, THE COMBINATION COMPRISING: AT LEAST TWO SOURCES OF CONDITIONED VENTILATION AIR, ONE OF WHICH DURING THE BUILDING HEATING SEASON IS HOTTER THAN THE OTHERS AND IS IDENTIFIED AS THE FIRST SOURCE; BAFFLE MEMBERS IN CERTAIN ONES OF SAID CELLS TO DIVIDE THOSE CERTAIN CELLS INTO AN EXTERIOR PORTION OUTBOARD OF THE BAFFLE AND AN INTERIOR PORTION INBOARD OF THE BAFFLE; FIRST CONDUIT MEANS EXTENDING FROM THE SAID FIRST SOURCE TRANSVERSELY OF THE SAID PARALLEL CELLS ADJACENT TO THE PERIMETER OF THE BUILDING AND OUTBOARD OF THE SAID BAFFFLE MEMBERS; FLOW CONNECTIONS BETWEEN THE SAID FIRST CONDUIT MEANS AND THE SAID EXTERIOR PORTIONS OF THE SAID CELLS; ADDITIONAL CONDUIT MEANS EXTENDING FROM THE OTHER OF SAID SOURCES TRANSVERSELY OF THE SAID PARALLEL CELLS ALONG THE CENTRAL PORTION OF SAID CELLS INBOARD OF THE SAID BAFFLE MEMBERS; ADDITIONAL FLOW CONNECTIONS BETWEEN SAID ADDITIONAL CONDUIT MEANS AND (A) THOSE CELLS WHICH ARE FREE OF THE SAID BAFFLE MEMBERS AND (B) THE INTERIOR PORTIONS OF SAID CERTAIN CELLS HAVING BAFFLE MEMBERS, WHEREBY THE SAID CELLS HAVING BAFFLE MEMBERS RECEIVE AIR FROM SAID FIRST SOURCE IN THE EXTERIOR PORTION 